So, Pfizer's operations cross international borders and they engage in "aggressive tax planning". That seems prudent.
My company operates in much the same way, including being incorporated in Ireland as a plc. The difference between corporate tax rates has enabled us to grow our US manufacturing operations. By the end of this year we will have doubled our workforce within a two year period, providing a stable, middle to upper middle class income to hundreds of local residents. I'm not sure why that makes us bad guys.